Passing data to AVCapturePhoto on macOS

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Usually if you want to use AVCapturePhoto you do something like this:

func capturePhoto() {
   let photoSettings = AVCapturePhotoSettings()
   photoOutput?.capturePhoto(with: photoSettings, delegate: self)
}

Then when the photo is processed, photoOutput method is called:

internal func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
}

Question: Is it possible to pass custom data to photoOutput via .capturePhoto? .metadata is only accessible on iOS and everytime I set a value with the .value() method I get

[General] [<AVCapturePhotoSettings 0x600003882080> valueWithUniqueID:inPropertyWithKey:]: lookup of unknown key: 'key'.
avfoundation swift xcode macos
1 Answers

I think the best and easiest method is to use some other object as a delegate for the photo capture and also always create a new delegate instance for each capture action. This way you can pass additional data to the delegate object on init that you can use in the photoOutput(_:didFinishProcessingPhoto:) method.

I can highly recommend checking out the AVCam sample project from Apple. There they are doing exactly that.

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